Good thread
Myself, the most important thing is remembering the time spent enjoying the sport with friends and by yourself remembering about times past. Catching fish is a bonus. You can do the same thing every day in the same spot and things will be different. Way points seem to be the best referent's, Lose them as Aaron states and you have to start over, but it's the memory that helps. It's nice to always catch the big ones but being on a nice school of Crappies or Perch with ultra lite tackle, joking with my Buddy's, doesn't get any better than that. I don't think you have to write down about the great times you had with your buddy Dude.
You could write a diary, but when you have the chance to go fishin, you go. If I waited for the perfect day, I think my boat wouldn't see the water much. But that's just me.
This is a great topic Dude.